"Edited N files": The diff only shows lines added, but not lines removed

What version of the IDE extension are you using?

26.519

What subscription do you have?

OpenAI Codex

Which IDE are you using?

VS Code

What platform is your computer?

_No response_

What issue are you seeing?

After the agentic changes to the code, the "Edited N files" UI status only shows lines added, but not lines removed for the file diff.

<img width="620" height="68" alt="Image" src="https://github.com/user-attachments/assets/af0a3efe-758b-471a-80da-44cbfcc210f2" />

<img width="257" height="155" alt="Image" src="https://github.com/user-attachments/assets/ca82ea69-bd57-4d84-894e-c01dabeb3e25" />

What steps can reproduce the bug?

1. Make Codex alter the code in a way that removes some lines
2. Observe the UI status only shows lines added

What is the expected behavior?

The red number for lines removed should not be zero.

Additional information

_No response_